Practice question

What is the purpose of a differential lock on a heavy motor vehicle?

  1. To lock the steering wheel in place
  2. To force both drive wheels on an axle to turn at the same speed, improving traction on slippery or uneven surfaces
  3. To lock the vehicle's doors automatically
  4. To increase the top speed of the vehicle

Answer: B — To force both drive wheels on an axle to turn at the same speed, improving traction on slippery or uneven surfaces

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